Page 101 - PortGPT_V2.1_C8_Flipbook
P. 101

</SCRIPT>

                 </BODY>
                 </HTML>
                 Output of the Program 1 is:


























                        THE WHILE STATEMENT

                 The while statement or loop is used to repeat a set of instructions until a conditional expression
                 returns True. Once the expression returns False, the loop is terminated. Following is the syntax of
                 the while loop in JavaScript:

                 initialisation_expression;

                 while (conditional_expression) {
                    //loop body
                    update_expression;

                 }
                 Where,

                 •  initialisation_expression: In this expression, a variable is initialized. Unlike for loop, this section
                     appears outside the loop.
                 •  conditional_expression: Similar to for loop, this expression contains a logical condition which
                     evaluates either True or False.

                 •  update_expression: The loop control variable is updated here.
                 For example,

                 i = 0;

                 while(i<5)
                 {
                     document.write(i);
                     i++;

                 }

                                                                                               Loops in JavaScript  99
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